have a rev tech 100 engine high compression- need a VERY strong battery with the most cca's in the 850-s to 900 if possible have a bike master mg 20L-bs which isn't strong enough for the inital crank ? thanks

Wow, that's a very strong battery! We don't know of a battery that can output 850-900 cca's. The MG20L-BS has a cca of 240. We would suggest looking at the Shorai LFX24AH 12V that has a cca of 360. Our part number is 388-0016, to order add thru our quick order form, <a href="http://www.chaparral-racing.com/cart/quickaddtocart.aspx" target="_blank">http://www.chaparral-racing.com/cart/quickaddtocart.aspx</a> For more information on the Shorai battery, you can read more here: <a href="http://www.chaparral-racing.com/Product/shorai-lfx-battery/388-0001.aspx" target="_blank">http://www.chaparral-racing.com/Product/shorai-lfx-battery/388-0001.aspx</a>